The possibilities of obtaining metallic calcium from Serbian carbonate mineral raw materials
The experimental investigations defined both the technological scheme of the calcium production from limestone by aluminothermic process and the basic operating parameters of the particular technological phases. The limestone with high content of Mg, Na and K was used in the paper. X-ray an...
| Main Authors: | , , , , , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
Association of the Chemical Engineers of Serbia
2014-01-01
|
| Series: | Chemical Industry and Chemical Engineering Quarterly |
| Subjects: | |
| Online Access: | http://www.doiserbia.nb.rs/img/doi/1451-9372/2014/1451-93721300022S.pdf |
| Summary: | The experimental investigations defined both the technological scheme of the
calcium production from limestone by aluminothermic process and the basic
operating parameters of the particular technological phases. The limestone
with high content of Mg, Na and K was used in the paper. X-ray analysis
reveals that the samples contain mainly calcite with small amount of
dolomite. At first, the influence of temperature, time and granulometry on
the calcium carbonate calcination was examined. The dissociation process was
completed in 10-15 min at 1200°C, and dissociation rate increases with
decreasing of particle size up to 5 mm. Afterwards, the aluminothermic
reduction process of calcium oxide was investigated. At the temperature
1200°C, and vacuum of at least 3 kPa, the reduction process completed within
2 hours. The chemical composition of calcium oxide and calcium showed
increased content of magnesium oxide and alkaline oxides (especially
sodium).[Projekat Ministartsva nauke Republike Srbije, br. TR34002 i br.
TR34023] |
|---|---|
| ISSN: | 1451-9372 2217-7434 |